I apologize for not being clearer. In Buttons Remapper, if you choose shortcuts rather than apps in the Other section, you get a choice of ready-made shortcuts.

But, for example, you made your own shortcut to a document and stored it on the desktop, that custom shortcut will not appear as a shortcut choice in Buttons Remapper.

Apologies again for my lack of clarity,

Jake

If I select an option Shortcut, I can choose Total Commander, here I can then select any file (document/media etc. file and after pressing keys it opens in proper app). There is also option to use Tasker, here I can select any task. OK?

I installed it, enabled the accessibility service, and can set up simple shortcuts. If I tap on the ‘Premium features’ or try to create a Combination shortcut, it shows a ‘Premium upgrade’ dialog — but when I tap on its UPGRADE button, nothing happens!

The only thing that would make Buttons remapper perfect would be per-app combinations. I would love to use the same combination but have it do different things depending on the app I'm in, just like a desktop OS.